This calculator uses two standard lender affordability guidelines. The front-end ratio (also called the housing ratio) limits your total monthly housing costs, principal, interest, taxes, and insurance, to 28% of your gross monthly income. The back-end ratio (debt-to-income ratio) limits all monthly debt payments including housing to 43% of your gross monthly income.
The maximum affordable home price is found by binary search: the calculator iterates to find the highest home price where the estimated total monthly payment stays within both ratio limits. The binding constraint (whichever ratio produces a lower maximum) determines your result.
This is an estimate based on standard conventional loan guidelines. FHA, VA, and jumbo loans use different limits. Actual qualification depends on your credit score, employment history, assets, and lender-specific criteria. Always get pre-approved to know your actual buying power.
Related reading: Rent vs Buy for First-Time Homebuyers